In 2010, Florida programmer and BitcoinTalk user Laszlo Hanyecz
offered to pay 10,000 Bitcoins for pizza. This transaction is
famously known throughout the cryptocommunity as the first real
world transaction/purchase used with Bitcoin. It is now known as
Bitcoin Pizza Day.

Hanyecz posted on BitcoinTalk that he would give 10,000 bitcoins
to anyone who brought him a pizza. Someone in the U.K. took him
up on it, ordered two pizzas from Papa John's in Hanyecz’s
area, paid $25 for them, and got the 10,000 bitcoins in exchange.

And Bitcoin Pizza Day, May 22, was born.

Bitcoins had no real value back then. They were estimated to be
worth 0.003 cents each, Tran reports. So 10,000 of them were
theoretically worth about $30. So at the time, Hanyecz’s was kind
of getting the pizza for free.

Flash forward four years. If the person hung onto those 10,000
coins, with bitcoin hitting $500 again on Wednesday, that person
would have $5 million worth of bitcoins today. That's more than a
fair trade for $25 worth of pizza.

That person would also be able to spend them at a whole bunch of
places, including more than 100 pizza joints, according to
SpendCoin.com.

If you want to celebrate Bitcoin Pizza Day but your local pizza
place doesn't accept them,
Tran has this suggestion:

eGifter,
an online retailer specializing in electronic gift cards, is
celebrating Bitcoin Pizza Day by giving an extra point per dollar
spent on pizza-related gift card purchases on May 22 made
with Bitcoin, Litecoin, and even Dogecoin.